almonds; 1>. p. 206 — 207°, sp. gr. I'2o8 at 15°; m. p. 3*;
soluble in water, soluble in alcohol, ether, and benzene.
A'cui'/to//. — Pour a drop of nitrobenzene into a test-tub^ with
1 c.c. water and i c.c. glacial acetic acid. Adda little zinc-dust
on the point of a penknife, and warm for a minute. Dilute
with a few c.c. of water, and add caustic soda solution until
alkaline, and pour a few drops into a test-tube half filled with
sodium hypochlorite solution. A violet colouration, which
gradually fades, is produced, due to the presence of aniline
(see p. 150). See Appendix^ p. 274.
P REPARATION 49.
Azoxybenzene, CWN -- N .C(JHfj
Klingcr, /?<v., 1882, 15, 865.
200 grins, methyl alcohol
20 ,, sodium.
30 ,, nitrobenzene.
Attach an upright condenser to a round flask (J, litre). Pour
in the methyl alcohol and add the sodium in small pieces,
2 — 3 grams at a time. A good stream of water should pass
through the condenser, but otherwise the flask need not be
cooled. When the sodium has dissolved, the nitrobenzene is
introduced, and the mixture boiled on a water-bath three to
four hours. The methyl alcohol is then distilled off in the
water-bath. As the liquid is liable to bump, owing to the
separation of solid mailer, it is advisable to add a few bits of
pot. When no more alcohol distils, the residue is poured into a
beaker of water and rinsed out. A. dark-coloured oil is deposited,
which soon solidifies, and is then washed by decantation, and
pressed on a porous plate. Yield about 23 grains. It is re-
crystallised, when dry, from ligrom, in which it is rather soluble.
crtics*— Yellow needles ; in. p. 36 . vSee Appendix*